9 files declare their use of DestructableInterface
- CacheCollector.php in core/lib/ Drupal/ Core/ Cache/ CacheCollector.php 
- Destructable.php in core/modules/ system/ tests/ modules/ destructable_test/ src/ Destructable.php 
- LocaleTranslation.php in core/modules/ locale/ src/ LocaleTranslation.php 
- ModuleHandlerInterface.php in core/lib/ Drupal/ Core/ Extension/ ModuleHandlerInterface.php 
- PerformanceDataCollector.php in core/modules/ system/ tests/ modules/ performance_test/ src/ PerformanceDataCollector.php 
- Registry.php in core/lib/ Drupal/ Core/ Theme/ Registry.php 
- RouteBuilder.php in core/lib/ Drupal/ Core/ Routing/ RouteBuilder.php 
- TestClass.php in core/modules/ system/ tests/ modules/ service_provider_test/ src/ TestClass.php 
- ThemeRegistry.php in core/lib/ Drupal/ Core/ Utility/ ThemeRegistry.php 
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